4. The Ministers may at any time designate any area as an area unsuitable, for health reasons, for the production or collection of—
(a)live bivalve molluscs;
(b)live echinoderms, tunicates and marine gastropods;
(c)live shellfish,
and any such area shall be designated, as appropriate, as a “designated prohibited area for live bivalve mollusc production”, a “designated prohibited area for live echinoderm, tunicate and marine gastropod production” or a “designated prohibited area for live shellfish production”.